refactor: update Return to handle array input

Update the `Return ` definition to handle cases where the value
is an array, joining elements with a comma.

Also, expanded and updated tests to expand coverage of additional
edge cases.

Author: TimeTravelPenguin

algorithmic.typ

@@ -205,6 +205,6 @@
 
 // Instructions
 #let Assign(var, val) = (var + " " + $<-$ + " " + arraify(val).join(", "),)
-#let Return(arg) = (strong("return") + " " + arg,)
+#let Return(arg) = (strong("return") + " " + arraify(arg).join(", "),)
 #let Terminate = (smallcaps("terminate"),)
 #let Break = (smallcaps("break"),)

tests/return/ref/1.png

@@ -3,5 +3,12 @@
 #set page(margin: .1cm, width: 4cm, height: auto)
 #algorithm({
   import algorithmic: *
+
+  let Foo = Fn.with("foo")
+  let Bar = Call.with("bar")
+
   Return[$x$]
+  Return($x$)
+  Return(Foo[$x$])
+  Return(Bar[$x$])
 })